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install-build-deps requires lsb_release, add a note for Crostini
to install lsb-release before running install-build-deps

Bug: None
Test: sudo apt install lsb-release; install-build-deps.sh --no-arm
Change-Id: I642275a4aa6ac22ff9c71733a4b4911db23bc392
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716605
Auto-Submit: David Munro <davidmunro@google.com>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680354}